src/ui/console.c

   1 #include "system/stacktrace.h"
   2
   3 #include "ebisp/gc.h"
   4 #include "ebisp/interpreter.h"
   5 #include "ebisp/parser.h"
   6 #include "ebisp/scope.h"
   7 #include "ebisp/std.h"
   8 #include "game/level.h"
   9 #include "sdl/renderer.h"
  10 #include "system/log.h"
  11 #include "system/log_script.h"
  12 #include "system/lt.h"
  13 #include "system/nth_alloc.h"
  14 #include "ui/console.h"
  15 #include "ui/console_log.h"
  16 #include "ui/edit_field.h"
  17 #include "ui/history.h"
  18 #include "broadcast.h"
  19
  20 #define FONT_WIDTH_SCALE 3.0f
  21 #define FONT_HEIGHT_SCALE 3.0f
  22
  23 #define CONSOLE_LOG_CAPACITY 10
  24 #define HISTORY_CAPACITY 20
  25 #define PROMPT_HEIGHT (FONT_HEIGHT_SCALE * FONT_CHAR_HEIGHT)
  26 #define CONSOLE_LOG_HEIGHT (FONT_HEIGHT_SCALE * FONT_CHAR_HEIGHT * CONSOLE_LOG_CAPACITY)
  27
  28 #define CONSOLE_HEIGHT (CONSOLE_LOG_HEIGHT + PROMPT_HEIGHT)
  29
  30 #define SLIDE_DOWN_TIME 0.4f
  31
  32 #define CONSOLE_ALPHA (0.80f)
  33 #define CONSOLE_BACKGROUND (rgba(0.20f, 0.20f, 0.20f, CONSOLE_ALPHA))
  34 #define CONSOLE_FOREGROUND (rgba(0.80f, 0.80f, 0.80f, CONSOLE_ALPHA))
  35 #define CONSOLE_ERROR (rgba(0.80f, 0.50f, 0.50f, CONSOLE_ALPHA))
  36
  37 #define CONSOLE_EVAL_RESULT_SIZE 256
  38
  39 struct Console
  40 {
  41     Lt *lt;
  42     Gc *gc;
  43     struct Scope scope;
  44     Edit_field *edit_field;
  45     Console_Log *console_log;
  46     History *history;
  47     float a;
  48     char *eval_result;
  49 };
  50
  51 /* TODO(#355): Console does not support Emacs keybindings */
  52 /* TODO(#356): Console does not support autocompletion */
  53 /* TODO(#357): Console does not show the state of the GC of the script */
  54 /* TODO(#358): Console does not support copy, cut, paste operations */
  55
  56 Console *create_console(Broadcast *broadcast,
  57                         const Sprite_font *font)
  58 {
  59     Lt *lt = create_lt();
  60
  61     if (lt == NULL) {
  62         return NULL;
  63     }
  64
  65     Console *console = PUSH_LT(lt, nth_calloc(1, sizeof(Console)), free);
  66     if (console == NULL) {
  67         RETURN_LT(lt, NULL);
  68     }
  69     console->lt = lt;
  70
  71     console->gc = PUSH_LT(lt, create_gc(), destroy_gc);
  72     if (console->gc == NULL) {
  73         RETURN_LT(lt, NULL);
  74     }
  75
  76     console->scope.expr = CONS(console->gc,
  77                                NIL(console->gc),
  78                                NIL(console->gc));
  79
  80     load_std_library(console->gc, &console->scope);
  81     load_log_library(console->gc, &console->scope);
  82     /* TODO(#669): how to report EvalResult error from create_console? */
  83     broadcast_load_library(broadcast, console->gc, &console->scope);
  84
  85     console->edit_field = PUSH_LT(
  86         lt,
  87         create_edit_field(
  88             font,
  89             vec(FONT_WIDTH_SCALE, FONT_HEIGHT_SCALE),
  90             CONSOLE_FOREGROUND),
  91         destroy_edit_field);
  92     if (console->edit_field == NULL) {
  93         RETURN_LT(lt, NULL);
  94     }
  95
  96     console->console_log = PUSH_LT(
  97         lt,
  98         create_console_log(
  99             font,
 100             vec(FONT_WIDTH_SCALE, FONT_HEIGHT_SCALE),
 101             CONSOLE_LOG_CAPACITY),
 102         destroy_console_log);
 103
 104     console->a = 0;
 105
 106     console->eval_result = PUSH_LT(
 107         lt,
 108         nth_calloc(1, sizeof(char) * CONSOLE_EVAL_RESULT_SIZE),
 109         free);
 110     if (console->eval_result == NULL) {
 111         RETURN_LT(lt, NULL);
 112     }
 113     memset(console->eval_result, 0, sizeof(char) * CONSOLE_EVAL_RESULT_SIZE);
 114
 115     console->history = PUSH_LT(
 116         lt,
 117         create_history(HISTORY_CAPACITY),
 118         destroy_history);
 119     if (console->history == NULL) {
 120         RETURN_LT(lt, NULL);
 121     }
 122
 123     return console;
 124 }
 125
 126 void destroy_console(Console *console)
 127 {
 128     trace_assert(console);
 129     RETURN_LT0(console->lt);
 130 }
 131
 132 static int console_eval_input(Console *console)
 133 {
 134     const char *source_code = edit_field_as_text(console->edit_field);
 135
 136     /* TODO(#387): console pushes empty strings to the history */
 137     if (history_push(console->history, source_code) < 0) {
 138         return -1;
 139     }
 140
 141     if (console_log_push_line(console->console_log, source_code, CONSOLE_FOREGROUND) < 0) {
 142         return -1;
 143     }
 144
 145     while (*source_code != 0) {
 146         struct ParseResult parse_result = read_expr_from_string(console->gc,
 147                                                                 source_code);
 148
 149         if (parse_result.is_error) {
 150             if (console_log_push_line(console->console_log, parse_result.error_message, CONSOLE_ERROR)) {
 151                 return -1;
 152             }
 153
 154             edit_field_clean(console->edit_field);
 155
 156             return 0;
 157         }
 158
 159         struct EvalResult eval_result = eval(
 160             console->gc,
 161             &console->scope,
 162             parse_result.expr);
 163
 164         if (expr_as_sexpr(
 165                 eval_result.expr,
 166                 console->eval_result,
 167                 CONSOLE_EVAL_RESULT_SIZE) < 0) {
 168             return -1;
 169         }
 170
 171         if (console_log_push_line(console->console_log,
 172                           console->eval_result,
 173                           eval_result.is_error ?
 174                           CONSOLE_ERROR :
 175                           CONSOLE_FOREGROUND)) {
 176             return -1;
 177         }
 178
 179         source_code = next_token(parse_result.end).begin;
 180     }
 181
 182     gc_collect(console->gc, console->scope.expr);
 183     edit_field_clean(console->edit_field);
 184
 185     return 0;
 186 }
 187
 188 int console_handle_event(Console *console,
 189                          const SDL_Event *event)
 190 {
 191     switch(event->type) {
 192     case SDL_KEYDOWN:
 193         switch(event->key.keysym.sym) {
 194         case SDLK_RETURN:
 195             return console_eval_input(console);
 196
 197         case SDLK_UP:
 198             edit_field_replace(
 199                 console->edit_field,
 200                 history_current(console->history));
 201             history_prev(console->history);
 202             return 0;
 203
 204         case SDLK_DOWN:
 205             edit_field_replace(
 206                 console->edit_field,
 207                 history_current(console->history));
 208             history_next(console->history);
 209             return 0;
 210         }
 211         break;
 212     }
 213
 214     return edit_field_handle_event(console->edit_field, event);
 215 }
 216
 217 int console_render(const Console *console,
 218                    SDL_Renderer *renderer)
 219 {
 220     /* TODO(#364): console doesn't have any padding around the edit fields */
 221     SDL_Rect view_port;
 222     SDL_RenderGetViewport(renderer, &view_port);
 223
 224     const float e = console->a * (2 - console->a);
 225     const float y = -(1.0f - e) * CONSOLE_HEIGHT;
 226
 227     if (fill_rect(renderer,
 228                   rect(0.0f, y,
 229                        (float) view_port.w,
 230                        CONSOLE_HEIGHT),
 231                   CONSOLE_BACKGROUND) < 0) {
 232         return -1;
 233     }
 234
 235     if (console_log_render(console->console_log,
 236                    renderer,
 237                    vec(0.0f, y)) < 0) {
 238         return -1;
 239     }
 240
 241     if (edit_field_render(console->edit_field,
 242                           renderer,
 243                           vec(0.0f, y + CONSOLE_LOG_HEIGHT)) < 0) {
 244         return -1;
 245     }
 246
 247     return 0;
 248 }
 249
 250 int console_update(Console *console, float delta_time)
 251 {
 252     trace_assert(console);
 253
 254     if (console->a < 1.0f) {
 255         console->a += 1.0f / SLIDE_DOWN_TIME * delta_time;
 256
 257         if (console->a > 1.0f) {
 258             console->a = 1.0f;
 259         }
 260     }
 261
 262     return 0;
 263 }
 264
 265 void console_slide_down(Console *console)
 266 {
 267     trace_assert(console);
 268     console->a = 0.0f;
 269 }